C     PROGRAM CROSS2
C	(DATA MANIPULATION PART OF PROGRAM CROSS)
C
C     DESCRIPTION
C	THIS PROGRAM WRITES MAP FILES AND MODIFIED DATA FILES CONTAINING
C	CODED RESPONSES TO A QUESTIONNAIRE.  A MAPPING OPTION ALLOWS
C	RESPONSES TO BE GROUPED INTO NEW CATEGORIES, WHILE JOINING AND
C	POOLING OPTIONS LET THE USER CONSTRUCT NEW VARIABLES.  MODIFIED
C	VERSIONS OF THE DATA FILE MAY BE SAVED FOR USE IN SUBSEQUENT
C	RUNS OF THIS PROGRAM OR RELATED PROGRAMS.  THE USER HAS ACCESS
C	AT ALL TIMES TO EVERY VARIABLE IN THE SURVEY (AS MANY AS 128).
C
C     SOURCE
C	NORMAN W. JOHNSON, DEPARTMENT OF MATHEMATICS, WHEATON COLLEGE,
C	NORTON, MASS.
C
C     INSTRUCTIONS
C	THE CODED RESPONSES TO THE QUESTIONNAIRE SHOULD BE READ FROM
C	CARDS AND WRITTEN INTO AN ASCII DATA FILE BY THE PROGRAM SURVEY.
C	A PRELIMINARY TABULATION OF MARGINAL FREQUENCIES FOR ALL VARI-
C	ABLES THE USER INTENDS TO WORK WITH CAN BE OBTAINED BY RUNNING
C	THE PROGRAM SORTER.  CROSS-TABULATIONS AND OTHER ANALYSIS OF THE
C	DATA CAN BE CARRIED OUT USING THE PROGRAM CROSS1.
C
C	THE PROGRAM WILL FIRST REQUEST THE USER TO ENTER THE NAME OF
C	THE DATA FILE.  AFTER THIS IS DONE, A DESCRIPTION OF THE SURVEY
C	WILL BE TYPED.  THE USER MAY THEN PROCEED TO REDEFINE OR RE-
C	STORE CATEGORIES WITH ONE OF THE COMMANDS "MAP" OR "UNMAP", MAY
C	CONSTRUCT OR DELETE VARIABLES WITH ONE OF THE COMMANDS "JOIN",
C	"POOL", OR "CUT", MAY TYPE "SAVE" TO PRESERVE THE CURRENT FORM
C	OF THE DATA AS A NEW FILE, MAY RESTORE THE ORIGINAL FORM OF THE
C	DATA WITH THE COMMAND "RESET", OR MAY TERMINATE THE EXECUTION OF
C	THE PROGRAM BY TYPING "STOP".
C
C	COMMANDS THAT TAKE VARIABLES AS ARGUMENTS MAY HAVE THE LIST OF
C	VARIABLES ENTERED ON THE SAME LINE AS THE COMMAND.
C
C	THE COMMAND "MAP" ENABLES THE USER TO REGROUP THE RESPONSES TO
C	ANY QUESTION.  FOR EACH VARIABLE OR BLOCK OF VARIABLES, THE USER
C	SPECIFIES HOW MANY NEW CATEGORIES ARE TO BE CREATED, THEN LISTS
C	THE CODE NUMBERS (0 TO 13) OF THE RESPONSES TO BE INCLUDED IN
C	EACH GROUP.  NUMBERS MAY BE LISTED INDIVIDUALLY, SEPARATED BY
C	COMMAS, OR TWO NUMBERS MAY BE JOINED BY A HYPHEN TO FORM A BLOCK
C	OF CONSECUTIVE RESPONSES.  BY TYPING "1" OR "KEEP" WHEN THE NUM-
C	BER OF NEW CATEGORIES IS REQUESTED, THE USER MAY PRESERVE THE
C	CURRENT GROUPING.  TYPING "0" OR "UNMAP" RESTORES THE ORIGINAL
C	CODING.  TYPING "-1" OR "REFLECT" REVERSES THE EXISTING CATE-
C	GORIES.  TYPING "X" OR "EXCLUDE" ELIMINATES ALL CATEGORIES.  A
C	LIST OF THE CURRENT CATEGORIES MAY BE OBTAINED BY TYPING "LIST".
C
C	AFTER EACH MAPPING THE USER MUST INDICATE WHETHER ANY CATEGORIES
C	ARE TO BE EXCLUDED.  IF NOT, AN EXCLUSION CODE OF 0 IS ENTERED.
C	OTHERWISE, THE EXCLUSION CODE IS 1 IF THE USER DESIRES TO OMIT
C	THE HIGHEST NUMBERED CATEGORY, 2 IF THE TWO HIGHEST CATEGORIES
C	ARE TO BE OMITTED, ETC.  LIKEWISE, AN EXCLUSION CODE OF -1 MAY
C	BE USED TO OMIT THE LOWEST NUMBERED CATEGORY, AND SO ON.  AN EX-
C	CLUSION CODE CANNOT LEAVE FEWER THAN TWO CATEGORIES.  HOWEVER,
C	THE USER MAY TYPE "X" TO ELIMINATE ALL CATEGORIES.
C
C	THE COMMAND "UNMAP" CANCELS THE EFFECT OF THE CURRENT MAPPING OF
C	THE VARIABLE OR VARIABLES SPECIFIED, THUS RESTORING THE ORIGINAL
C	CODING OF THE RESPONSES TO EACH QUESTION.  THE ORIGINAL CODING
C	IS ALSO RESTORED WHEN THE PROGRAM IS RUN FROM THE BEGINNING,
C	UNLESS A MODIFIED VERSION OF THE DATA FILE HAS BEEN SAVED.
C
C	THE COMMAND "JOIN" ALLOWS THE USER TO COMBINE TWO OR THREE VARI-
C	ABLES INTO ONE NEW VARIABLE.  ALL COMBINATIONS OF CATEGORIES
C	FOR THE GIVEN VARIABLES ARE ARRANGED IN A TABLE, WHICH THE USER
C	FILLS IN WITH THE NUMBERS (0 TO 9 WITH 11, 12, AND 13 FOR EX-
C	CLUSIONS) TO BE ASSIGNED TO THE CORRESPONDING CATEGORIES OF THE
C	NEW VARIABLE.  AS IN THE CASE OF THE "XTAB" COMMAND, WHEN THREE
C	VARIABLES ARE LISTED, THE USER MAY SELECT OR REJECT A PARTICULAR
C	CATEGORY OF THE THIRD VARIABLE.  THE "JOIN" COMMAND ALSO ALLOWS
C	SINGLE VARIABLES TO BE DUPLICATED AND PROVIDES A WAY OF HANDLING
C	VARIABLES WITH TWO- OR THREE-DIGIT CATEGORY NUMBERS.
C
C	THE COMMAND "POOL" MAY BE USED TO CONSTRUCT AN INDEX VARIABLE
C	FROM A BLOCK OF VARIABLES WITH SCALED RESPONSES, E.G., QUESTIONS
C	DESIGNED TO MEASURE RESPONDENTS' ATTITUDES.  THE TOTAL SCORE OF
C	EACH RESPONDENT FOR THE BLOCK OF QUESTIONS IS COMPUTED, DIVIDED
C	BY THE NUMBER OF QUESTIONS, AND ROUNDED TO THE NEAREST INTEGER.
C	THE RESULTING CATEGORY NUMBER PLACES THE RESPONDENT ON A SCALE
C	FOR THE INDEX VARIABLE COMPARABLE TO THE ONE EMPLOYED FOR THE
C	VARIABLES USED TO CONSTRUCT IT.
C
C	THE COMMAND "CUT" PERMITS THE DELETION OF THE HIGHEST NUMBERED
C	VARIABLE OR VARIABLES, EITHER TO MAKE ROOM FOR NEW VARIABLES TO
C	BE CREATED BY JOINING OR POOLING OR TO ELIMINATE ONE OR MORE OF
C	THOSE MOST RECENTLY CREATED.  THE USER SPECIFIES THE NUMBER OF
C	VARIABLES TO BE REMOVED BY ENTERING A DELETION CODE.
C
C	THE COMMAND "SAVE" ENABLES THE USER TO PRESERVE THE CURRENT FORM
C	OF THE DATA, INCORPORATING ALL MAPS, JOINS, POOLS, AND CUTS, AS
C	A NEW DATA FILE.  THIS FILE MUST BE GIVEN A NAME, DIFFERENT FROM
C	THAT OF ANY EXISTING DATA FILE, CONSISTING OF FROM ONE TO FIVE
C	CHARACTERS.  THE NAME MAY BE SPECIFIED IN THE "SAVE" COMMAND
C	(E.G., "SAVE FILNM") OR SEPARATELY.
C
C	THE COMMAND "RESET" RESTORES THE INITIAL STATE OF THE DATA, THUS
C	UNDOING THE EFFECTS OF ALL MAPS, UNMAPS, JOINS, POOLS, AND CUTS.
C
C	AFTER ANY OF THE ABOVE COMMANDS IS CARRIED OUT, A NEW COMMAND
C	MAY BE GIVEN.  THE USER MAY SUPPRESS THE PRINTING OF TABLES OR
C	ANY OTHER OUTPUT IN ORDER TO GIVE A NEW COMMAND IMMEDIATELY BY
C	TYPING <CTRL>O AND PRESSING <RETURN>.  FURTHER EXECUTION OF A
C	COMMAND MAY BE HALTED AT ANY BREAK POINT BY TYPING "ABORT".
C
C	WHENEVER THE USER IS EXPECTED TO GIVE A COMMAND OR TO PROVIDE
C	CERTAIN INFORMATION NEEDED FOR THE EXECUTION OF A COMMAND, AN
C	EXPLANATION OF WHAT IS REQUIRED MAY BE OBTAINED BY TYPING THE
C	WORD "EXPLAIN" OR SIMPLY A QUESTION MARK.
C
C     REFERENCES
C	JAMES A. DAVIS, 'ELEMENTARY SURVEY ANALYSIS', PRENTICE-HALL,
C	    ENGLEWOOD CLIFFS, N.J., 1971.
C	JOHAN GALTUNG, 'THEORY AND METHODS OF SOCIAL RESEARCH', COLUMBIA
C	    UNIVERSITY PRESS, NEW YORK, 1967.
C	E. TERRENCE JONES, 'CONDUCTING POLITICAL RESEARCH', HARPER &
C	    ROW, NEW YORK, 1971.
C
C     ..................................................................
C
      INTEGER A(48),TODAY(2),BLANK,PRIME,STAR,DIFFER,EQUAL
      INTEGER L(0/128),H(0/128),R(0/128)
      INTEGER MAP(0/128,0/13),X(128),IA(0/21),OLD(13)
      INTEGER JOIN(0/13,0/13,0/13)
      LOGICAL GROUP,ERROR,ZERO,REJECT,BLURB,POOL,SWITCH
      EQUIVALENCE (JOIN,NUM)
      COMMON ENTRY(0/13),LIST
      DATA TEMP1,TEMP2 /'TEMP1','TEMP2'/
      TEMP = 'TEMP2'
      BLANK  = 17315143744
      PRIME  = 21073240128
      STAR   = 22548578304
      DIFFER = 32472301568
      EQUAL  = 32749125632
      CALL TIME(NOW)
      LIST = NOW-851968
      CALL DATE(TODAY)
      TYPE 1, NOW,TODAY
    1 FORMAT (' CROSS2',8X,A5,9X,2A5//)
C
C     START:  LOCATE DATA FILE.
   20 TYPE 2
    2 FORMAT (/' NAME OF SURVEY? ',$)
C     ENTER FILE NAME.
   30 ACCEPT 3, ORIG
    3 FORMAT (12A5)
   31 FORMAT (/A5)
   32 FORMAT (//A5)
   33 FORMAT (8X,A5)
   34 FORMAT ('+'/$)
      IF (ORIG.EQ.' ') GO TO 20
      IF (ORIG.EQ.'STOP') GO TO 2000
      DATA = ORIG
      GROUP = RENAME(DATA,'.MAP',DATA,'.MAP')
      IF (GROUP) CALL IFIL(21,DATA,'.MAP')
      IF (GROUP) READ (21,31) DATA
      IF (RENAME(DATA,'.DAT',DATA,'.DAT')) GO TO 40
      TYPE 4, DATA
    4 FORMAT (' CANNOT FIND DATA FILE ',A5/)
      GO TO 20
   40 CALL IFILE(1,DATA)
C     INPUT DESCRIPTION OF SURVEY.
   50 READ (1,5) (A(I),I=1,48)
    5 FORMAT (/48A1)
      DO 60  I=48,1,-1
      IF (A(I).NE.BLANK) GO TO 70
   60 A(I) = 0
   70 TYPE 7, (A(I),I=1,48)
    7 FORMAT (9X,48A1////)
      LAST = 0
      IF (.NOT.GROUP) GO TO 100
C     GROUP RESPONSES TO EACH QUESTION.
   80 READ (21,10) M
      READ (21,14) (L(I),I=1,M)
      READ (21,14) (H(I),I=1,M)
      READ (21,16) (X(I),I=1,M)
      DO 85  J=0,13
      READ (21,16) (R(I),I=1,M)
      DO 85  I=1,M
   85 MAP(I,J) = JK(R(I))
      READ (1,10) MAX
      M = MIN0(M,MAX)
      READ (1,32) ID
      IF (LAST) 190,190,200
C     INPUT NUMBER OF QUESTIONS.
  100 READ (1,10) M
   10 FORMAT (20I)
  101 FORMAT (9I1,9L1)
  102 FORMAT (I2)
  103 FORMAT (3I,2A1)
  104 FORMAT (I,2A1)
C     INPUT LOWEST NUMBER USED AS CODED RESPONSE TO EACH QUESTION.
  120 READ (1,14) (L(I),I=1,M)
C     INPUT HIGHEST NUMBER USED AS CODED RESPONSE TO EACH QUESTION.
  140 READ (1,14) (H(I),I=1,M)
   14 FORMAT (5X,128I1)
C     INPUT MAPPING INDICATOR FOR EACH QUESTION.
  160 READ (1,16) (X(I),I=1,M)
   16 FORMAT (5X,128A1)
  180 DO 185  J=0,13
      DO 185  I=1,M
  185 MAP(I,J) = J
      IF (LAST.GT.0) GO TO 200
  190 READ (1,3) ID
      IF (ID.NE.BLANK) GO TO 190
C     INPUT NUMBER OF RESPONDENTS.
      READ (1,10) LAST
      TOTAL = LAST
      GO TO 202
C
C     ENTER COMMAND.
  200 TYPE 201
  201 FORMAT ('1')
  202 TYPE 203
  203 FORMAT (' ENTER COMMAND: ',$)
      ACCEPT 3, (ENTRY(N),N=1,12)
      CALL DECODE
      READ (20,3) ANS,SAVE
      IF (ANS.EQ.'START') GO TO 20
      IF (ANS.EQ.' ')     GO TO 200
      IF (ANS.EQ.'DETAI') GO TO 210
      IF (ANS.EQ.'EXPLA' .AND. SAVE.GT.'IN') GO TO 220
      IF (ANS.EQ.'MAP')   GO TO 1500
      IF (ANS.EQ.'UNMAP') GO TO 1600
      IF (ANS.EQ.'JOIN')  GO TO 1700
      IF (ANS.EQ.'POOL')  GO TO 1800
      IF (ANS.EQ.'CUT')   GO TO 1890
      IF (ANS.EQ.'SAVE')  GO TO 1900
      IF (ANS.EQ.'RESET') GO TO 1990
      IF (ANS.EQ.'STOP')  GO TO 2000
      IF (ANS.EQ.'XTAB')  TYPE 2031
      IF (ANS.EQ.'ITEM')  TYPE 2031
 2031 FORMAT (' COMMAND NOT AVAILABLE--RUN CROSS1'/)
      TYPE 204
  204 FORMAT (
     1  ' ENTER ONE OF THE FOLLOWING:'/
     2  ' 	MAP, UNMAP, JOIN, POOL, CUT, SAVE, RESET, STOP, OR'/
     3  ' 	DETAIL'/)
      GO TO 200
  210 TYPE 21
   21 FORMAT (
     1  ' 	TO REGROUP RESPONSES TO A QUESTION, TYPE "MAP".'/
     2  ' 	TO RESTORE THE ORIGINAL CATEGORIES, TYPE "UNMAP".'/
     3  ' 	TO DUPLICATE A VARIABLE WITH CURRENT CATEGORIES OR'/
     4  ' 	TO COMBINE 2 OR 3 VARIABLES INTO ONE, TYPE "JOIN".'/
     5  ' 	TO MAKE A SINGLE VARIABLE OF A BLOCK, TYPE "POOL".'/
     6  ' 	TO DELETE HIGHEST NUMBERED VARIABLES, TYPE "CUT".'/
     7  ' 	TO SAVE CURRENT VERSION OF DATA FILE, TYPE "SAVE".'/
     8  ' 	TO RESTORE ALL DATA TO INITIAL STATE, TYPE "RESET".'/
     9  ' 	TO TERMINATE THE PROGRAM, TYPE "STOP".'//
     /  ' 	TO HALT EXECUTION OF A COMMAND, TYPE "ABORT".'/
     1  ' 	TO GET HELP AT ANY POINT, TYPE "EXPLAIN" OR "?".'//
     2  ' 	FOR A MORE COMPLETE EXPLANATION OF ANY OF THE ABOVE'/
     3  ' 	COMMANDS, TYPE "EXPLAIN" AND THE NAME OF THE COMMAND.'/)
      GO TO 200
  220 REREAD 33, ANS
      IF (ANS.EQ.'ABORT') TYPE 221
  221 FORMAT (
     1  ' 	FURTHER EXECUTION OF A COMMAND MAY BE HALTED AT ANY'/
     2  ' 	BREAK POINT BY TYPING "ABORT".  TO SUPPRESS THE PRINT-'/
     3  ' 	ING OF TABLES OR OTHER OUTPUT, TYPE <CTRL>O AND PRESS'/
     4  ' 	<RETURN>.'/)
      IF (ANS.EQ.'EXPLA' .OR. ANS.EQ.'?') TYPE 222
  222 FORMAT (
     1  ' 	IF YOU NEED AN EXPLANATION OR FURTHER INSTRUCTIONS,'/
     2  ' 	YOU MAY RESPOND TO ANY REQUEST FOR INPUT BY TYPING'/
     3  ' 	"EXPLAIN" OR A QUESTION MARK.'/)
      IF (ANS.EQ.'MAP')   TYPE 1501
      IF (ANS.EQ.'MAP')   TYPE 1502
      IF (ANS.EQ.'UNMAP') TYPE 1602
      IF (ANS.EQ.'JOIN')  TYPE 1702
      IF (ANS.EQ.'POOL')  TYPE 1802
      IF (ANS.EQ.'CUT')   TYPE 1891
      IF (ANS.EQ.'SAVE')  TYPE 1901
      IF (ANS.EQ.'RESET') TYPE 1991
      IF (ANS.EQ.'STOP')  TYPE 2002
      GO TO 200
  232 FORMAT ('+INVALID ENTRY--VARIABLES RUN FROM  1  TO ',I3/)
  233 FORMAT ('+INVALID ENTRY--VARIABLE WITHOUT CATEGORIES'/)
C
C     MAP:  REGROUP CATEGORIES.
 1500 ZERO = ENTRY(0).NE.ANS .OR. ENTRY(1).EQ.' '
      IF (ZERO) TYPE 150
  150 FORMAT (' VARIABLES TO BE MAPPED? ',$)
      IF (ZERO) ACCEPT 3, (ENTRY(N),N=1,12)
      IF (ENTRY(1).EQ.'NONE' .OR. ENTRY(1).EQ.'ABORT') GO TO 200
      IF (ENTRY(1).EQ.'STOP') GO TO 2000
      BLURB = ENTRY(1).EQ.'EXPLA' .OR. ENTRY(1).EQ.'?'
      IF (BLURB) TYPE 1501
      IF (BLURB) TYPE 1502
 1501 FORMAT (
     1  ' 	ENTER ONE OR MORE VARIABLES WHOSE RESPONSES ARE TO BE'/
     2  ' 	REGROUPED.  (IF YOU DO NOT WANT TO MAP ANY VARIABLES,'/
     3  ' 	TYPE "NONE".)  A BLOCK OF CONSECUTIVE VARIABLES (TWO'/
     4  ' 	NUMBERS JOINED BY A HYPHEN OR THE WORD "ALL") CAN BE'/
     5  ' 	MAPPED SIMULTANEOUSLY.  FOR EACH VARIABLE TO BE MAPPED')
 1502 FORMAT (
     6  ' 	SPECIFY THE NUMBER OF NEW CATEGORIES DESIRED.  THEN'/
     7  ' 	FOR EACH GROUP LIST THE CODE NUMBERS OF THE RESPONSES'/
     8  ' 	TO BE INCLUDED IN IT (TWO NUMBERS MAY BE JOINED BY A'/
     9  ' 	HYPHEN TO INDICATE A BLOCK OF CONSECUTIVE RESPONSES).'/
     /  ' 	EVERY CATEGORY MUST BE MAPPED.'//
     1  ' 	YOU CAN PRESERVE THE CURRENT GROUPING BY ENTERING "1"'/
     2  ' 	OR "KEEP" FOR THE NUMBER OF NEW CATEGORIES; ENTERING'/
     3  ' 	"0" OR "UNMAP" RESTORES THE ORIGINAL CODING (IN EITHER'/
     4  ' 	CASE EXCLUSIONS MAY STILL BE MADE).  ENTERING "-1" OR'/
     5  ' 	"REFLECT" REVERSES EXISTING CATEGORIES.  ENTERING "X"'/
     6  ' 	OR "EXCLUDE" ELIMINATES ALL CATEGORIES.  TO ASCERTAIN'/
     7  ' 	THE CURRENT MAPPING, TYPE "LIST".  IF YOU HAVE ENTERED'/
     8  ' 	MORE VARIABLES THAN YOU WANT TO MAP, TYPE "ABORT".'/)
      CALL DECODE
      READ (20,10) (IA(N),N=1,20)
      IF (ENTRY(0).EQ.'ALL') IA(1) = 1
      IF (ENTRY(0).EQ.'ALL') IA(2) = -M
      IF (IA(1).EQ.0) GO TO 1500
      DO 1505  N=1,20
      IF (IA(N).GE.0 .AND. IA(N).LE.M) GO TO 1505
      IF (IA(N-1).GT.0.AND.IA(N-1).LE.-IA(N).AND.-IA(N).LE.M) GO TO 1505
      TYPE 232, M
      GO TO 1500
 1505 CONTINUE
      NVAR = 1
      I = IA(1)
      GO TO 1520
 1510 TYPE 151
  151 FORMAT ('+DUPLICATE MAPPING--START OVER'/)
 1520 MIN = I
      MAX = MAX0(I,-IA(NVAR+1))
      IF (MAX.LE.I) TYPE 1521, I
 1521 FORMAT (//
     1  ' VARIABLE ',I3/)
      IF (MAX.GT.I) TYPE 1522, MIN,MAX
 1522 FORMAT (//
     1  ' VARIABLES ',I3,'  TO ',I3/)
      TYPE 152
  152 FORMAT (' HOW MANY NEW CATEGORIES? ',$)
      ACCEPT 3, ENTRY(1)
      IF (ENTRY(1).EQ.'ABORT') GO TO 200
      IF (ENTRY(1).EQ.' ')     GO TO 1520
      IF (ENTRY(1).EQ.'REFLE' .OR. ENTRY(1).EQ.'-1') GO TO 1650
      IF (ENTRY(1).EQ.'EXCLU' .OR. ENTRY(1).EQ.'X')  GO TO 1660
      IF (ENTRY(1).EQ.'LIST')  GO TO 1690
      IF (ENTRY(1).EQ.'STOP')  GO TO 2000
      IF (ENTRY(1).EQ.'EXPLA' .OR. ENTRY(1).EQ.'?')  TYPE 1502
      LOW = (ENTRY(1).EQ.'10')+1
      IF (ENTRY(1).EQ.'10')    ENTRY(1) = '9'
      IF (ENTRY(1).EQ.'UNMAP') ENTRY(1) = '0'
      IF (ENTRY(1).EQ.'KEEP')  ENTRY(1) = '1'
      CALL DECODE
      READ (20,101,ERR=1520) NCAT
      IF (NCAT.EQ.0 .AND. IA(NVAR+1).LT.0) GO TO 1610
      IF (NCAT.EQ.1) GO TO 1590
      CALL IFILE(1,DATA)
      READ (1,32) ID
      READ (1,14) (IL,N=1,I)
      READ (1,14) (IH,N=1,I)
      READ (1,16) (IX,N=1,I)
      IF (NCAT.EQ.0) GO TO 1580
      DO 1525  J=0,13
 1525 MAP(I,J) = 10
      TYPE 34
      DO 1570  K=LOW,NCAT
      GO TO 1540
 1530 TYPE 153
  153 FORMAT ('+INCORRECT GROUPING--REENTER'/$)
      DO 1535  J=0,13
 1535 IF (MAP(I,J).EQ.K) MAP(I,J) = 10
 1540 TYPE 154, K
  154 FORMAT ('+  GROUP ',I1,''': ',$)
      ACCEPT 3, (ENTRY(N),N=1,10)
      IF (ENTRY(1).EQ.'ABORT' .OR. ENTRY(1).EQ.'UNMAP') GO TO 1580
      IF (ENTRY(1).EQ.'STOP') GO TO 2000
      BLURB = ENTRY(1).EQ.'EXPLA' .OR. ENTRY(1).EQ.'?'
      IF (BLURB) TYPE 1541
 1541 FORMAT (
     1  ' 	ENTER THE ORIGINAL CODE NUMBERS OF THE RESPONSES TO BE'/
     2  ' 	INCLUDED IN EACH GROUP.  TO START OVER, TYPE "UNMAP".'/
     3  ' 	TO QUIT MAPPING, TYPE "ABORT".'//$)
      IF (BLURB .OR. ENTRY(1).EQ.' ') GO TO 1540
      IF (ENTRY(1).LT.'0') GO TO 1530
      CALL DECODE
      READ (20,10) (OLD(N),N=1,12)
      IF (OLD(1).GT.13) GO TO 1530
      IF (OLD(2).LT.0)  GO TO 1545
      J = OLD(1)
      IF (MAP(I,J).NE.10) GO TO 1510
      MAP(I,J) = K
 1545 DO 1570  N=2,12
      IF (IABS(OLD(N)).GT.13) GO TO 1530
      IF (OLD(N)) 1550,1570,1560
 1550 IF (OLD(N-1).LT.0 .OR. OLD(N-1).GT.-OLD(N)) GO TO 1530
      DO 1555  J=OLD(N-1),-OLD(N)
      IF (MAP(I,J).EQ.K)  GO TO 1530
      IF (MAP(I,J).NE.10) GO TO 1510
 1555 MAP(I,J) = K
      GO TO 1570
 1560 IF (OLD(N-1).NE.0 .OR. N.EQ.2) GO TO 1565
      IF (MAP(I,J).EQ.K)  GO TO 1530
      IF (MAP(I,0).NE.10) GO TO 1510
      MAP(I,0) = K
 1565 IF (OLD(N+1).LT.0)  GO TO 1570
      J = OLD(N)
      IF (MAP(I,J).EQ.K)  GO TO 1530
      IF (MAP(I,J).NE.10) GO TO 1510
      MAP(I,J) = K
 1570 CONTINUE
      DO 1575  J=IL,IH
      IF (MAP(I,J).NE.10) GO TO 1575
      TYPE 157
  157 FORMAT ('+INCOMPLETE MAPPING--START OVER'/$)
      ENTRY(1) = 'ERROR'
      GO TO 1580
 1575 CONTINUE
      L(I) = LOW
      H(I) = NCAT
      X(I) = PRIME
      GO TO 1590
 1580 L(I) = IL
      H(I) = IH
      X(I) = IX
      DO 1585  J=0,13
 1585 MAP(I,J) = J
      IF (ENTRY(1).NE.'ERROR') TYPE 161
      IF (ENTRY(1).EQ.'ABORT') GO TO 200
      IF (NCAT.NE.0) GO TO 1520
 1590 IF (L(I)+1.LT.H(I)) GO TO 1680
      TYPE 159
  159 FORMAT (' NO EXCLUSIONS'/$)
      K = 0
 1595 NVAR = NVAR+1
      I = IA(NVAR)
      IF (I) 1630,200,1520
C
C     UNMAP:  RESTORE ORIGINAL CATEGORIES.
 1600 ZERO = ENTRY(0).NE.ANS .OR. ENTRY(1).EQ.' '
      IF (ZERO) TYPE 1601
 1601 FORMAT (' VARIABLES TO BE UNMAPPED? ',$)
      IF (ZERO) ACCEPT 3, (ENTRY(N),N=1,12)
      IF (ENTRY(1).EQ.' ALL') ENTRY(1) = 'ALL'
      IF (ENTRY(1).EQ.'NONE' .OR. ENTRY(1).EQ.'ABORT') GO TO 200
      IF (ENTRY(1).EQ.'STOP') GO TO 2000
      IF (ENTRY(1).EQ.'EXPLA' .OR. ENTRY(1).EQ.'?') TYPE 1602
 1602 FORMAT (
     1  ' 	ENTER ONE OR MORE VARIABLES WHOSE ORIGINAL CATEGORIES'/
     2  ' 	ARE TO BE RESTORED.  (IF YOU DO NOT WANT ANY VARIABLES'/
     3  ' 	TO BE UNMAPPED, TYPE "NONE".)  A BLOCK OF CONSECUTIVE'/
     4  ' 	VARIABLES (TWO NUMBERS JOINED BY A HYPHEN OR THE WORD'/
     5  ' 	"ALL") CAN BE UNMAPPED SIMULTANEOUSLY.'/)
      CALL DECODE
      READ (20,10) (IA(N),N=1,20)
      IF (ENTRY(0).EQ.'ALL') IA(1) = 1
      IF (ENTRY(0).EQ.'ALL') IA(2) = -M
      IF (IA(1).EQ.0) GO TO 1600
      DO 1605  N=1,20
      IF (IA(N).GE.0 .AND. IA(N).LE.M) GO TO 1605
      IF (IA(N-1).GT.0.AND.IA(N-1).LE.-IA(N).AND.-IA(N).LE.M) GO TO 1605
      TYPE 232, M
      GO TO 1600
 1605 CONTINUE
      NVAR = 1
      I = IA(1)
 1610 TYPE 161
  161 FORMAT (' ORIGINAL CATEGORIES RESTORED'/)
 1620 MIN = I
      MAX = MAX0(I,-IA(NVAR+1))
      CALL IFILE(1,DATA)
      READ (1,32) ID
      READ (1,184) (IL,I=0,MIN-1),(L(I),I=MIN,MAX)
      READ (1,184) (IH,I=0,MIN-1),(H(I),I=MIN,MAX)
      READ (1,186) (IX,I=0,MIN-1),(X(I),I=MIN,MAX)
      DO 1625  I=MIN,MAX
      DO 1625  J=0,13
 1625 MAP(I,J) = J
      IF (IA(NVAR+1).LT.0) NVAR = NVAR+1
      IF (ANS.EQ.'MAP') GO TO 1595
      NVAR = NVAR+1
      I = IA(NVAR)
      IF (I) 200,200,1620
C     MAP BLOCK OF CONSECUTIVE VARIABLES.
 1630 IF (NCAT.GT.1) GO TO 1640
      DO 1635  I=MIN,MAX
      IF (K.LT.0) L(I) = MIN0(L(I)-K,H(I)-1)
      IF (K.GT.0) H(I) = MAX0(L(I)+1,H(I)-K)
 1635 CONTINUE
      GO TO 1595
 1640 DO 1645  I=MIN,MAX
      L(I) = L(MIN)
      H(I) = H(MIN)
      X(I) = PRIME
      DO 1645  J=0,13
 1645 MAP(I,J) = MAP(MIN,J)
      GO TO 1595
C     REFLECT BLOCK OF CONSECUTIVE VARIABLES.
 1650 TYPE 165
  165 FORMAT (' PREVIOUS CATEGORIES REVERSED'/)
      DO 1655  I=MIN,MAX
      X(I) = BLANK
      DO 1655  J=0,13
      IF (MAP(I,J).LT.L(I) .OR. MAP(I,J).GT.H(I)) GO TO 1655
      MAP(I,J) = L(I)+H(I)-MAP(I,J)
      IF (MAP(I,J).NE.J) X(I) = PRIME
 1655 CONTINUE
      IF (IA(NVAR+1).LT.0) NVAR = NVAR+1
      GO TO 1595
C     EXCLUDE BLOCK OF CONSECUTIVE VARIABLES.
 1660 TYPE 166
  166 FORMAT (' ALL CATEGORIES EXCLUDED'/)
      DO 1665  I=MIN,MAX
      L(I) = 9
      H(I) = 0
      X(I) = STAR
 1665 CONTINUE
      IF (IA(NVAR+1).LT.0) NVAR = NVAR+1
      GO TO 1595
C     EXCLUDE HIGHEST (OR LOWEST) CATEGORIES.
 1670 TYPE 167
  167 FORMAT (
     1  ' ENTER NUMBER OF GROUPS TO BE EXCLUDED:'/
     2  ' 	0--FOR NO EXCLUSIONS'/
     3  ' 	1--FOR EXCLUSION OF THE HIGHEST NUMBERED GROUP'/
     4  ' 	2--FOR EXCLUSION OF THE TWO HIGHEST GROUPS'/
     5  ' 	ETC.  (NEGATIVE CODES EXCLUDE LOWEST GROUPS.)'/)
 1680 TYPE 168
  168 FORMAT (' ENTER EXCLUSION CODE: ',$)
      ACCEPT 3, ENTRY(1)
      IF (ENTRY(1).EQ.'ABORT' .OR. ENTRY(1).EQ.'UNMAP') GO TO 1580
      IF (ENTRY(1).EQ.'X')    GO TO 1660
      IF (ENTRY(1).EQ.' ')    GO TO 1680
      IF (ENTRY(1).EQ.'STOP') GO TO 2000
      CALL DECODE
      READ (20,102,ERR=1670) K
      IF (K.GE.10) K = K/10
      IF (K.LT.0) L(I) = MIN0(L(I)-K,H(I)-1)
      IF (K.GT.0) H(I) = MAX0(L(I)+1,H(I)-K)
      GO TO 1595
C     LIST CURRENT CATEGORIES.
 1690 IF (L(I).GT.H(I)) TYPE 169
  169 FORMAT ('   NO CATEGORIES')
      TYPE 34
      DO 1695  J=0,13
      IF (MAP(I,J).LT.L(I) .OR. MAP(I,J).GT.H(I)) GO TO 1695
      TYPE 1691, J
 1691 FORMAT ('+',I3,$)
      IF (X(I).NE.BLANK) TYPE 1692, MAP(I,J),X(I)
 1692 FORMAT ('+ --> ',I1,A1/$)
 1695 CONTINUE
      IF (X(I).EQ.BLANK) TYPE 34
      GO TO 1520
C
C     JOIN:  DUPLICATE OR COMBINE VARIABLES.
 1700 IF (M.GE.128) GO TO 1790
      ZERO = ENTRY(0).NE.ANS .OR. ENTRY(1).EQ.' '
      IF (ZERO) TYPE 1701
 1701 FORMAT (' VARIABLES TO BE JOINED? ',$)
      IF (M.GE.128) GO TO 1790
      IF (ZERO) ACCEPT 3, (ENTRY(N),N=1,12)
      IF (ENTRY(1).EQ.'NONE' .OR. ENTRY(1).EQ.'ABORT') GO TO 200
      IF (ENTRY(1).EQ.'STOP') GO TO 2000
      BLURB = ENTRY(1).EQ. 'EXPLA' .OR. ENTRY(1).EQ.'?'
      IF (BLURB) TYPE 1702
 1702 FORMAT (
     1  ' 	ENTER ONE VARIABLE TO BE DUPLICATED (WITH THE CURRENT'/
     2  ' 	DEFINITION OF CATEGORIES) OR TWO OR THREE VARIABLES'/
     3  ' 	TO BE COMBINED INTO ONE NEW VARIABLE.  TABLE HEADINGS'/
     4  ' 	WILL BE PRINTED FOR EVERY COMBINATION OF CATEGORIES OF'/
     5  ' 	THE OLD VARIABLES.  DEFINE THE CATEGORIES OF THE NEW'/
     6  ' 	VARIABLE BY FILLING IN THE TABLE.  USE CATEGORY NUM-'/
     7  ' 	BERS 0 TO 9 OR EXCLUSION CATEGORIES 11, 12, AND 13.'//
     8  ' 	NOTE:  THE THIRD VARIABLE LISTED MAY BE FOLLOWED BY AN'/
     9  ' 	EQUALS SIGN AND A CATEGORY NUMBER (0 TO 9).  AN ENTRY'/
     /  ' 	IN THE FORM ''V1,V2,V3=C'' ALLOWS THE JOINING OF VARI-'/
     1  ' 	ABLES V1 AND V2 FOR RESPONDENTS BELONGING TO CATEGORY'/
     2  ' 	C OF VARIABLE V3, ALL OTHERS BEING EXCLUDED.  AN ENTRY'/
     3  ' 	IN THE FORM ''V1,0,V3=C'' PROVIDES FOR THE RESTRICTION'/
     4  ' 	OF VARIABLE V1 TO RESPONDENTS IN CATEGORY C OF VARI-'/
     5  ' 	ABLE V3.  A PARTICULAR CATEGORY OF RESPONDENTS MAY BE'/
     6  ' 	EXCLUDED BY FOLLOWING THE THIRD VARIABLE WITH AN IN-'/
     7  ' 	EQUALITY SIGN (<>) AND THE CATEGORY NUMBER.  IF YOU DO'/
     8  ' 	NOT WANT TO JOIN ANY VARIABLES, TYPE "NONE".'/)
      CALL DECODE
      READ (20,103) I1,I2,I3,N3,N3X
      IF (I1.EQ.0) GO TO 1700
      ERROR = I1.LT.0 .OR. I1.GT.M .OR. I2.LT.0 .OR. I2.GT.M .OR.
     1  I3.LT.0 .OR. I3.GT.M
      IF (ERROR) TYPE 232, M
      IF (ERROR) GO TO 1700
      ERROR = L(I1).GT.H(I1) .OR. L(I2).GT.H(I2) .OR. L(I3).GT.H(I3)
      IF (ERROR) TYPE 233
      IF (ERROR) GO TO 1700
      NEW = M+1
      L(NEW) = 9
      H(NEW) = 0
      X(NEW) = BLANK
      DO 1705  J=0,13
 1705 MAP(NEW,J) = J
      DO 1710  J3=0,13
      DO 1710  J2=0,13
      DO 1710  J1=0,13
 1710 JOIN(J1,J2,J3) = 10
      J3X = JK(N3X)
      IF (J3X.GT.9) J3X = -1
      REJECT = (N3.EQ.'<' .OR. N3.EQ.'>') .AND. J3X.GE.0
      J3 = JK(N3)
      IF (J3.GT.9) J3 = J3X
      IF (I2.NE.0 .OR. J3.GE.0) GO TO 1715
      I2 = I3
      I3 = 0
 1715 I3L = L(I3)
      I3H = H(I3)
      IF (J3.LT.0) GO TO 1720
      I3L = J3
      I3H = J3
 1720 IF (I2.NE.0) TYPE 34
      TYPE 172, NEW
  172 FORMAT (//
     1  ' NEW:      VARIABLE ',I3)
      IF (I2.EQ.0) TYPE 1721, I1
 1721 FORMAT (
     2  ' SOURCE:   VARIABLE ',I3)
      IF (I2.NE.0) TYPE 1722, I1,I2
 1722 FORMAT (
     2  ' DOWN:     VARIABLE ',I3/
     3  ' ACROSS:   VARIABLE ',I3)
      R(3) = EQUAL
      IF (REJECT) R(3) = DIFFER
      IF (I3L.NE.I3H) TYPE 1723, I3
 1723 FORMAT (
     4  ' CONTROL:  VARIABLE ',I3)
      IF (I3.NE.0 .AND. I3L.EQ.I3H) TYPE 1724, I3,R(3),J3,X(I3)
 1724 FORMAT (
     4  ' CONTROL:  VARIABLE ',I3,2X,A2,'  CATEGORY  ',I1,A1)
      IF (I2.NE.0) GO TO 1740
      TYPE 34
      DO 1730  J1=0,13
 1730 JOIN(J1,0,J3) = J1
      L(NEW) = L(I1)
      H(NEW) = H(I1)
      GO TO 1780
 1740 TYPE 174
  174 FORMAT (///' NEW CATEGORY NUMBERS:')
      R(3) = 0
      IF (X(I3).EQ.PRIME) R(3) = PRIME
      DO 1780  J3=I3L,I3H
 1750 TYPE 175, (J2,X(I2),J2=L(I2),H(I2))
  175 FORMAT (//5X,$/('+',I3,A1,$))
      IF (I3L.NE.I3H) TYPE 1751, J3,R(3)
 1751 FORMAT ('+   (',I1,A1,')',$)
      TYPE 34
      TYPE 34
      DO 1770  J1=L(I1),H(I1)
 1760 TYPE 176, J1,X(I1)
  176 FORMAT ('+',I1,A1,4X,$)
      ACCEPT 3, (ENTRY(N),N=1,10)
      IF (ENTRY(1).EQ.'ABORT') GO TO 200
      IF (ENTRY(1).EQ.'DELET') GO TO 1740
      IF (ENTRY(1).EQ.'STOP')  GO TO 2000
      BLURB = ENTRY(1).EQ.'EXPLA' .OR. ENTRY(1).EQ.'?'
      IF (BLURB) TYPE 1761
 1761 FORMAT (
     1  ' 	DEFINE THE CATEGORIES OF YOUR NEW VARIABLE BY FILLING'/
     2  ' 	IN THIS TABLE.  USE CATEGORY NUMBERS 0 TO 9 OR EXCLU-'/
     3  ' 	SION CATEGORIES 11, 12, AND 13.  TO START OVER, TYPE'/
     4  ' 	"DELETE".  TO QUIT, TYPE "ABORT".'//)
      IF (BLURB .OR. ENTRY(1).EQ.' ') GO TO 1760
      CALL DECODE
      READ (20,10) (JOIN(J1,J2,J3),J2=L(I2),H(I2))
      DO 1770  J2=L(I2),H(I2)
      J = JOIN(J1,J2,J3)
      IF (J.GE.0 .AND. J.LE.13 .AND. J.NE.10) GO TO 1770
      TYPE 177
  177 FORMAT ('+ILLEGAL CATEGORY--REENTER'/)
      GO TO 1760
 1770 CONTINUE
      DO 1780  J1=L(I1),H(I1)
      DO 1780  J2=L(I2),H(I2)
      J = JOIN(J1,J2,J3)
      IF (J.GT.9) GO TO 1780
      IF (J.LT.L(NEW)) L(NEW) = J
      IF (J.GT.H(NEW)) H(NEW) = J
 1780 CONTINUE
      IF (.NOT.REJECT) GO TO 1820
      DO 1785  J1=L(I1),H(I1)
      DO 1785  J2=L(I2),H(I2)
      J = JOIN(J1,J2,J3X)
      JOIN(J1,J2,J3X) = 10
      DO 1785  J3=L(I3),H(I3)
      IF (J3.NE.J3X) JOIN(J1,J2,J3) = J
 1785 CONTINUE
      GO TO 1820
 1790 TYPE 179
  179 FORMAT (' NO ROOM FOR NEW VARIABLE'/)
      GO TO 200
C
C     POOL:  CONSOLIDATE BLOCK OF VARIABLES.
 1800 IF (M.GE.128) GO TO 1790
      ZERO = ENTRY(0).NE.ANS .OR. ENTRY(1).EQ.' '
      IF (ZERO) TYPE 1801
 1801 FORMAT (' VARIABLES TO BE POOLED? ',$)
      IF (M.GE.127) GO TO 1790
      IF (ZERO) ACCEPT 3, (ENTRY(N),N=1,12)
      IF (ENTRY(1).EQ.'NONE' .OR. ENTRY(1).EQ.'ABORT') GO TO 200
      IF (ENTRY(1).EQ.'STOP') GO TO 2000
      BLURB = ENTRY(1).EQ.'EXPLA' .OR. ENTRY(1).EQ.'?'
      IF (BLURB) TYPE 1802
 1802 FORMAT (
     1  ' 	ENTER A BLOCK OF VARIABLES (TWO NUMBERS JOINED BY A'/
     2  ' 	HYPHEN OR THE WORD "ALL") TO BE USED IN CONSTRUCTING'/
     3  ' 	AN INDEX VARIABLE, CATEGORIZING RESPONDENTS BY THEIR'/
     4  ' 	AVERAGE RESPONSE.  THE "MAP" COMMAND CAN BE USED TO'/
     5  ' 	REVERSE CATEGORIES OF CERTAIN VARIABLES OR TO EXCLUDE'/
     6  ' 	VARIABLES FROM A BLOCK.  IF YOU DO NOT WANT TO POOL'/
     7  ' 	ANY VARIABLES, TYPE "NONE".'/)
      CALL DECODE
      READ (20,10) MIN,MAX
      MAX = IABS(MAX)
      IF (ENTRY(0).EQ.'ALL') MIN = 1
      IF (ENTRY(0).EQ.'ALL') MAX = M
      IF (MIN.EQ.0) GO TO 1800
      ERROR = MIN.LT.0 .OR. MIN.GT.MAX .OR. MAX.GT.M
      IF (ERROR) TYPE 232, M
      IF (ERROR) GO TO 1800
      NVAR = MAX-MIN+1
      NEW = M+1
      L(NEW) = 9
      H(NEW) = 0
      DO 1805  I=MIN,MAX
      IF (L(I).GT.H(I)) NVAR = NVAR-1
      IF (L(I).LT.L(NEW)) L(NEW) = L(I)
      IF (H(I).GT.H(NEW)) H(NEW) = H(I)
 1805 CONTINUE
      IF (NVAR.GT.0) GO TO 1810
      TYPE 233
      GO TO 1800
 1810 TYPE 181, NEW,MIN,MAX
  181 FORMAT (//
     1  ' NEW:      VARIABLE ',I3/
     2  ' SOURCE:   VARIABLES ',I3,'  TO ',I3/)
      X(NEW) = BLANK
      DO 1815  J=0,13
 1815 MAP(NEW,J) = J
C     WRITE NEW DATA FILE.
 1820 POOL = ANS.EQ.'POOL'
      TEMP = TEMP1
      IF (SWITCH) TEMP = TEMP2
      CALL IFILE(1,DATA)
      CALL OFILE(21,TEMP)
      READ (1,32) ID
      WRITE (21,5) (A(I),I=1,48)
 1830 WRITE (21,183) NEW
  183 FORMAT (2X,I3,' VARIABLES')
      IL = 'LOW'
      READ (1,14) (R(I),I=1,M)
      R(NEW) = L(NEW)
      WRITE (21,184) IL,(R(I),I=1,NEW)
      IH = 'HIGH'
      READ (1,14) (R(I),I=1,M)
      R(NEW) = H(NEW)
      WRITE (21,184) IH,(R(I),I=1,NEW)
  184 FORMAT (A5,128I1)
      IX = NK(13)
      READ (1,3) ID
      WRITE (21,186) IX
      DO 1860  K=1,LAST
      READ (1,186) ID,(R(I),I=1,M)
      IF (POOL) GO TO 1850
      J1 = MAP(I1,JK(R(I1)))
      J2 = MAP(I2,JK(R(I2)))
      J3 = MAP(I3,JK(R(I3)))
      R(NEW) = NK(JOIN(J1,J2,J3))
      GO TO 1860
 1850 KVAR = 0
      KSUM = 0
      DO 1855  I=MIN,MAX
      IF (L(I).GT.H(I)) GO TO 1855
      J = MAP(I,JK(R(I)))
      IVAR = (J.LT.L(I) .OR. J.GT.H(I))+1
      KVAR = KVAR+IVAR
      KSUM = KSUM+IVAR*J
 1855 CONTINUE
      J = 10
      KTAB = (2*KVAR.LT.NVAR)+1
      LESS = 2*KSUM.LT.(L(NEW)+H(NEW))*KVAR
      IF (KTAB.NE.0) J = (2*KSUM+KVAR+LESS)/(2*KVAR)
      R(NEW) = NK(J)
 1860 WRITE (21,186) ID,(R(I),I=1,NEW)
  186 FORMAT (A5,128A1)
      WRITE (21,187) LAST
  187 FORMAT (/1X,I4,' RESPONDENTS')
      END FILE 21
      DATA = TEMP
      IF (SWITCH) CALL OFILE(21,TEMP1)
      SWITCH = .NOT.SWITCH
      IF (SWITCH) CALL OFILE(21,TEMP2)
      END FILE 21
      M = NEW
      GO TO 200
C
C     CUT:  DELETE HIGHEST NUMBERED VARIABLES.
 1880 TYPE 188
  188 FORMAT (
     1  ' ENTER NUMBER OF VARIABLES TO BE DELETED:'/
     2  ' 	0--FOR NO DELETIONS'/
     3  ' 	1--FOR DELETION OF THE HIGHEST NUMBERED VARIABLE'/
     4  ' 	2--FOR DELETION OF THE TWO HIGHEST VARIABLES'/
     5  ' 	ETC. (UP TO 9 AT ONE TIME)'/)
 1890 TYPE 189
  189 FORMAT (' ENTER DELETION CODE: ',$)
      ACCEPT 3, ENTRY(1)
      IF (ENTRY(1).EQ.'ABORT') GO TO 200
      IF (ENTRY(1).EQ.' ')     GO TO 1890
      IF (ENTRY(1).EQ.'STOP')  GO TO 2000
 1891 FORMAT (
     1  ' 	THIS COMMAND PERMITS THE DELETION OF THE HIGHEST NUM-'/
     2  ' 	BERED VARIABLE OR VARIABLES, COMPLEMENTING THE EFFECT'/
     3  ' 	OF THE COMMANDS "JOIN" AND "POOL".'/)
      CALL DECODE
      READ (20,101,ERR=1880) K
      M = MAX0(M-K,2)
      GO TO 200
C
C     SAVE:  PRESERVE CURRENT FORM OF DATA.
 1900 IF (SAVE.NE.' ') GO TO 1920
 1901 FORMAT (
     1  ' 	WITH THIS COMMAND YOU CAN PRESERVE THE CURRENT FORM OF'/
     2  ' 	THE DATA, MODIFIED BY ANY MAPS, JOINS, POOLS, OR CUTS,'/
     3  ' 	AS A NEW DATA FILE.  THIS FILE MUST BE GIVEN A NAME OF'/
     4  ' 	FROM ONE TO FIVE CHARACTERS.  THE NAME MAY FOLLOW THE'/
     5  ' 	WORD "SAVE" OR MAY BE ENTERED SEPARATELY.'/)
 1910 TYPE 191
  191 FORMAT (' NEW FILE NAME? ',$)
      ACCEPT 3, SAVE
      IF (SAVE.EQ.'NONE' .OR. SAVE.EQ.'ABORT') GO TO 200
      IF (SAVE.EQ.'STOP') GO TO 2000
      BLURB = SAVE.EQ.'EXPLA' .OR. SAVE.EQ.'?'
      IF (BLURB) TYPE 1911
 1911 FORMAT (
     1  ' 	THE CURRENT FORM OF THE DATA WILL BE PRESERVED AS A'/
     2  ' 	NEW DATA FILE.  ENTER THE NAME (FROM ONE TO FIVE CHAR-'/
     3  ' 	ACTERS) TO BE GIVEN TO THIS FILE.  IF YOU DO NOT WANT'/
     4  ' 	TO SAVE THE CURRENT DATA, TYPE "NONE".'/)
      IF (BLURB .OR. SAVE.EQ.' ') GO TO 1910
 1920 IF (.NOT.RENAME(SAVE,'.DAT',SAVE,'.DAT')) GO TO 1930
      TYPE 192
  192 FORMAT ('+NAME OF EXISTING DATA FILE CANNOT BE USED.'/)
      GO TO 1910
 1930 IF (RENAME(SAVE,'.DAT',TEMP,'.DAT')) DATA = SAVE
      SWITCH = SWITCH .XOR. RENAME(TEMP,'.DAT',SAVE,'.OLD')
      IF (RENAME(SAVE,'.OLD',SAVE,'.MAP')) TYPE 193, SAVE,SAVE
  193 FORMAT (' OLD FILE ',A5,'.MAP RENAMED ',A5,'.OLD'/)
      TEMP = TEMP1
      IF (SWITCH) TEMP = TEMP2
      CALL OFILE(21,TEMP)
      WRITE (21,31) DATA
      WRITE (21,183) M
      IL = 'LOW'
      WRITE (21,184) IL,(L(I),I=1,M)
      IH = 'HIGH'
      WRITE (21,184) IH,(H(I),I=1,M)
      IX = 'MAP'
      WRITE (21,186) IX,(X(I),I=1,M)
      DO 1960  J=0,13
      DO 1950  I=1,M
 1950 R(I) = NK(MAP(I,J))
 1960 WRITE (21,196) J, (R(I),I=1,M)
  196 FORMAT (I2,3X,128A1)
      END FILE 21
      SWITCH = SWITCH .XOR. RENAME(SAVE,'.MAP',TEMP,'.DAT')
      GO TO 200
C
C     RESET:  RESTORE DATA TO INITIAL STATE.
 1990 TYPE 199
  199 FORMAT (' DATA RESTORED TO INITIAL STATE'/)
 1991 FORMAT (
     1  ' 	THIS COMMAND RESTORES THE INITIAL STATE OF THE DATA,'/
     2  ' 	UNDOING THE EFFECTS OF ALL MAPS, UNMAPS, JOINS, POOLS,'/
     3  ' 	AND CUTS.'/)
      IF (DATA.EQ.TEMP) TEMP = ORIG
      DATA = ORIG
      IF (.NOT.GROUP) GO TO 1995
      CALL IFIL(21,DATA,'.MAP')
      READ (21,31) DATA
      IF (ORIG.EQ.TEMP) TEMP = DATA
 1995 CALL IFILE(1,DATA)
      READ (1,5) ID
      IF (GROUP) 80,100,100
C
C     STOP:  TERMINATE EXECUTION.
 2000 TYPE 34
      CALL OFIL(20,LIST,'.TMP')
      END FILE 20
      IF (DATA.NE.TEMP) STOP
 2002 FORMAT (
     1  ' 	THE COMMAND "STOP" MAY BE GIVEN AS A RESPONSE TO ANY'/
     2  ' 	REQUEST FOR INFORMATION.  EXECUTION OF THE PROGRAM IS'/
     3  ' 	TERMINATED, AND THE DATA FILE REVERTS TO ITS ORIGINAL'/
     4  ' 	FORM.'/)
      CALL OFILE(21,TEMP)
      END FILE 21
      STOP
      END
C
      FUNCTION JK(N)
      JK = N/536870912-48
      IF (JK.GE.0) RETURN
      JK = 10-(JK-3)/6
      RETURN
      END
C
      FUNCTION NK(J)
      IF (J.GE.10) J = (13-J)*(J-7)-J-3*(J/12)
      NK = (J+48)*536870912
      RETURN
      END
C
      SUBROUTINE DECODE
      COMMON ENTRY(0/13),LIST
      CALL OFIL(20,LIST,'.TMP')
      WRITE (20,3) (ENTRY(N),N=1,12)
    3 FORMAT (12A5)
      END FILE 20
      CALL IFIL(20,LIST,'.TMP')
      IF (ENTRY(1).LT.'MAP 0' .OR. ENTRY(1).GT.'MAP Z') GO TO 50
      READ (20,4) (ENTRY(N),N=0,12)
    4 FORMAT (A4,12A5)
      CALL OFIL(20,LIST,'.TMP')
      WRITE (20,3) (ENTRY(N),N=0,11)
      END FILE 20
      CALL IFIL(20,LIST,'.TMP')
      RETURN
   50 DO 55  N=0,12
   55 ENTRY(N) = ENTRY(N+1)
      RETURN
      END
C
C     LOGICAL FUNCTION RENAME(NEWNAM,NEWEXT,OLDNAM,OLDEXT)
C	RETURNS VALUE .FALSE. IF FILE OLDNAM.EXT DOES NOT EXIST.
C	OTHERWISE, RENAME IS .TRUE. AND FILE IS RENAMED NEWNAM.EXT
C	WITH PROTECTION <155>.  THIS SUBPROGRAM IS WRITTEN IN THE
C	MACRO-10 ASSEMBLER LANGUAGE.